Listen to Jimi Hendrix’s Previously Unreleased ‘Mannish Boy’ Cover

The song also happens to be the lead track on the upcoming album, a cover of the Muddy Waters blues classic "Mannish Boy." You can listen to it above.

The material on Both Sides of the Sky comes from January 1968 through February 1970, with focus on the period when Hendrix was working with bassist Billy Cox and drummer Buddy Miles in the trio that became Band of Gypsys. "Mannish Boy" was recorded during their first session on April 22, 1969, at the Record Plant in New York.

The group eventually made its public debut at the Fillmore East on New Year’s Eve 1969 and New Year’s Day 1970, shows that were documented on the 1970 album Band of Gypsysand 2016's Machine Gun: The Fillmore East First Show 12/31/69. The previously unreleased "Mannish Boy" gives a pretty clear picture where the trio was headed.

Experience Hendrix L.L.C. claims Both Sides of the Sky marks "the final volume in a trilogy of albums intended to present the best and most significant unissued studio recordings remaining in Jimi Hendrix’s archive." The first two records – 2010's Valleys of Neptune and 2013's People, Hell and Angels – both reached the Top 5.

The track listing for Both Sides of the Sky, which will be released on March 9, can be found below. The album was co-produced by Eddie Kramer, the recording engineer who worked with Hendrix on all of the albums released during his life. Kramer recently talked about the project on BBC Radio 6 Music.